/*
 * @author zhaoshangming
 * @version 1.0
 * @email zsm@ingx.net
 */
package cn.xspace.module.other.util;

import java.util.Random;

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Bitmap.Config;

public class RegusteractCode {
	private static RegusteractCode bmpCode;

	public static RegusteractCode getInstance() {
		if (bmpCode == null)
			bmpCode = new RegusteractCode();
		return bmpCode;
	}

	private static final int DEFAULT_FONT_SIZE = 25;
	private static final int DEFAULT_LINE_NUMBER = 2;
	private static final int BASE_PADDING_LEFT = 10, RANGE_PADDING_LEFT = 15,
			BASE_PADDING_TOP = 15, RANGE_PADDING_TOP = 20;
	private static final int DEFAULT_WIDTH = 130, DEFAULT_HEIGHT = 40;

	private int width = DEFAULT_WIDTH, height = DEFAULT_HEIGHT;

	private int base_padding_left = BASE_PADDING_LEFT,
			range_padding_left = RANGE_PADDING_LEFT,
			base_padding_top = BASE_PADDING_TOP,
			range_padding_top = RANGE_PADDING_TOP;

	private int line_number = DEFAULT_LINE_NUMBER,
			font_size = DEFAULT_FONT_SIZE;

	private String code;
	private int padding_left, padding_top;
	private Random random = new Random();

	public Bitmap createBitmap() {
		padding_left = 0;

		Bitmap bp = Bitmap.createBitmap(width, height, Config.ARGB_8888);
		Canvas c = new Canvas(bp);

		c.drawColor(Color.WHITE);
		Paint paint = new Paint();
		paint.setTextSize(font_size);

		for (int i = 0; i < code.length(); i++) {
			randomTextStyle(paint);
			randomPadding();
			c.drawText(code.charAt(i) + "", padding_left, padding_top, paint);
		}

		for (int i = 0; i < line_number; i++) {
			drawLine(c, paint);
		}

		c.save(Canvas.ALL_SAVE_FLAG);
		c.restore();
		return bp;
	}

	public String getCode() {
		return code;
	}

	public void setCode(String code) {
		this.code = code ;
	}

	private void drawLine(Canvas canvas, Paint paint) {
		int color = randomColor();
		int startX = random.nextInt(width);
		int startY = random.nextInt(height);
		int stopX = random.nextInt(width);
		int stopY = random.nextInt(height);
		paint.setStrokeWidth(1);
		paint.setColor(color);
		canvas.drawLine(startX, startY, stopX, stopY, paint);
	}

	private int randomColor() {
		return randomColor(1);
	}

	private int randomColor(int rate) {
		int red = random.nextInt(256) / rate;
		int green = random.nextInt(256) / rate;
		int blue = random.nextInt(256) / rate;
		return Color.rgb(red, green, blue);
	}

	private void randomTextStyle(Paint paint) {
		int color = randomColor();
		paint.setColor(color);
		paint.setFakeBoldText(random.nextBoolean());
		float skewX = random.nextInt(11) / 10;
		skewX = random.nextBoolean() ? skewX : -skewX;
		paint.setTextSkewX(skewX);

	}

	private void randomPadding() {
		padding_left += base_padding_left + random.nextInt(range_padding_left);
		padding_top = base_padding_top + random.nextInt(range_padding_top);
	}
}
